Ice formation in unsaturated frozen soils
Document typeConference report
PublisherThe Hong Kong University of Science and Technology (HKUST)
Rights accessOpen Access
This paper presents a procedure for determining unfrozen water saturation in a partially saturated frozen soil (clayey silt) using bulk electrical conductivity (EC) measurements. A modification of Archie’s law is proposed to describe the relationship between soil bulk EC, temperature, porosity and degree of unfrozen water saturation. Compacted samples have been prepared at a dry density around 1.90 Mg/m3 and at dif-ferent degrees of saturation. Samples have been then subjected to freezing paths up to -15 °C. Measurements of bulk EC along the temperature decrease and freezing paths have been used to calibrate parameters associ-ated with the proposed model. These calibrated models allow determining the amount of ice content for a given state of the partially saturated soil (porosity, initial degree of water saturation and temperature). The soil freezing retention curve has been also estimated by combining the Clausius-Clapeyron equation with water retention data on drying. A good agreement has been observed between the estimation based on EC measurements and results from water retention data, which validates the proposed procedure.
CitationMao, Y.; Romero, E.; Gens, A. Ice formation in unsaturated frozen soils. A: International Conference on Unsaturated Soils. "Unsaturated Soils: UNSAT 2018: The 7th International Conference on Unsaturated Soils". Hong Kong: The Hong Kong University of Science and Technology (HKUST), 2018, p. 597-602.